为了在Java中存储动态大小的元素,我们使用了ArrayList。每当添加新元素时,它会自动增加其大小。ArrayList实现Java的List接口和Java的Collection的一部分。 由于其...? 要在ArrayList中添加元素,我们可以使用add( )方法。这种方法有变化,使用取决于要求。 句法 arlist.add(“JavaTpoint”);在特定位置添加元素 ...
You don't have to provide any constructors for your class, but you must be careful when doing this. The compiler automatically provides a no-argument, default constructor for any class without constructors. This default constructor will call the no-argument constructor of the superclass. In thi...
vec.add("Java"); vec.add("Ruby");//Display vector elementsSystem.out.println("Vector elements:"+vec);//replace all vector element "Java" with "JavaTpoint"Collections.replaceAll(vec,"Java","JavaTpoint");//Display vector elements after replacementSystem.out.println("New vector elements:"+ ...